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WO2001003872A1 - Procede et dispositif d'usinage a decharge electrique - Google Patents

Procede et dispositif d'usinage a decharge electrique Download PDF

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Publication number
WO2001003872A1
WO2001003872A1 PCT/JP1999/003744 JP9903744W WO0103872A1 WO 2001003872 A1 WO2001003872 A1 WO 2001003872A1 JP 9903744 W JP9903744 W JP 9903744W WO 0103872 A1 WO0103872 A1 WO 0103872A1
Authority
WO
WIPO (PCT)
Prior art keywords
shape
machining
swing
divided
electric discharge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP1999/003744
Other languages
English (en)
Japanese (ja)
Inventor
Hidetaka Katougi
Takayuki Nakagawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to DE19983533T priority Critical patent/DE19983533B4/de
Priority to US09/786,866 priority patent/US6580049B1/en
Priority to JP2001509332A priority patent/JP3925197B2/ja
Priority to PCT/JP1999/003744 priority patent/WO2001003872A1/fr
Priority to CN99810799A priority patent/CN1126627C/zh
Publication of WO2001003872A1 publication Critical patent/WO2001003872A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
    • B23H7/26—Apparatus for moving or positioning electrode relatively to workpiece; Mounting of electrode
    • B23H7/28—Moving electrode in a plane normal to the feed direction, e.g. orbiting

Definitions

  • the present invention relates to an electric discharge machining method and apparatus for performing machining (oscillating machining) while oscillating an electrode on a workpiece in a plane perpendicular to a machining feed direction.
  • rocking machining electrical discharge machining is performed on the workpiece while the electrode is relatively moved with respect to the workpiece in a plane perpendicular to the machining feed direction, thereby efficiently discharging machining chips by stirring.
  • the purpose is to do well.
  • a simple shape such as a circle or a square is used as the swing shape, and the shape of the workpiece after processing is similar to the shape of the electrode.
  • a constant speed swing is performed with a constant turning speed, and an electrode and a workpiece as disclosed in Japanese Patent Application Laid-Open No. 6-125650.
  • the electrode movement amount is controlled based on the remaining processing amount.
  • the swing shape is divided to change the swing speed and determine the end of the swing motion, and it is determined whether the target machining shape has been reached for each of the divided shapes. In some cases, the rocking process is terminated when the judgment is made.
  • Such a processing method is disclosed in Japanese Patent Application Laid-Open No. 2-212206, Japanese Patent Application Laid-Open No. 6-126564. No. 0, Japanese Unexamined Patent Publication It is disclosed in Japanese Patent Publication No.
  • N 0 Z36 OXS (the fractional part is rounded down).
  • Fig. 11 is a diagram showing an example of the division of the swing shape in the swing machining in which the swing speed can be switched for each divided shape.
  • the target machining shape and the current electrode position are determined.
  • the turning speed is determined based on the remaining machining amount calculated from the difference, and if there is little leftover, a high turning speed (for example, V1 in Fig. 11) is given.
  • V1 in Fig. 11 For example, V 2 in FIG. 11 is given.
  • the electrode moves from the divided shape where the high-speed turning speed V1 is given to the divided shape where the low-speed turning speed V2 is given the speed difference between the high-speed turning speed V1 and the low-speed turning speed V2 is obtained.
  • the electrode When is large, the electrode reaches the divided shape where the high-speed turning speed V1 and the low-speed turning speed V2 are given due to a delay in the calculation time and the like. Accordingly, in such a case, the remaining shape is apt to occur, so that the shape accuracy is deteriorated and the processing time is prolonged. Disclosure of the invention
  • the electric discharge machining method according to a third aspect of the present invention is the electric discharge machining method according to the second aspect of the present invention, wherein the division of the oscillating shape is performed such that the division angle becomes smaller as approaching each corner of the target machining shape. Is what you do.
  • FIG. 2 is a block diagram showing the configuration of the swing calculation unit of the present invention.
  • FIG. 3 is an explanatory view showing a method of dividing the swing shape according to the present invention.
  • FIG. 6 is an explanatory diagram of a look-ahead function of an oscillating motion control unit in an electric discharge machine according to Embodiment 3 of the present invention.
  • FIG. 7 is a diagram showing a swing path.
  • FIG. 8 is a diagram showing an example of division of a conventional swing shape.
  • FIG. 9 is an explanatory view showing a conventional processing example.
  • FIG. 11 is an explanatory view showing a conventional processing example. BEST MODE FOR CARRYING OUT THE INVENTION
  • FIG. 1 is a configuration diagram showing an electric discharge machine according to a first embodiment of the present invention, in which 1 is a Z-axis driving motor, and 2 is a Z-axis driving motor 1 driven in the Z direction.
  • Z is the main spindle
  • 3 is the machining head fixed to Z axis 2
  • 4 is the electrode mounted on the machining head 3
  • 5 is the workpiece
  • 6 is the work table
  • 7 is the worktable 6.
  • the processing tank is mounted on the processing tank.
  • the processing liquid is injected into the processing tank 7 and the workpiece 5 is fixed.
  • 8 is an X-axis drive motor
  • 9 is an X-axis drive motor driven in the X direction by 8
  • 10 is a Y-axis drive motor and 11 is a Y-axis drive motor.
  • This is the Y axis driven in the Y direction by 10.
  • Reference numeral 12 denotes a power supply device
  • 13 denotes a numerical control device
  • 14 denotes
  • FIG. 2 is a block diagram showing the configuration of the swing operation unit 14.
  • the swing shape is divided based on the information on the swing process in the machining condition given by the machining condition setting unit 15.
  • the oscillating shape dividing unit 17 has a function to calculate the remaining machining amount obtained from the difference between the target oscillating shape and the current electrode position during machining.
  • the remaining machining amount calculation unit 18 has the function of the remaining machining amount, and the remaining machining amount calculated by the remaining machining amount calculation unit 17 is ⁇ 0 '' and stores the position of the oscillating shape in the divided shape that reaches the commanded machining depth And outputs an oscillating motion end signal.
  • the oscillating motion end determining unit has a function of storing the remaining machining amount.
  • 19 is the remaining machining calculated by the remaining machining amount calculation unit 17.
  • the swing motion control unit has a function of giving a low speed when the amount is large and a high turning speed when the remaining amount is small.
  • the machining can be performed with high accuracy by performing the ending judgment by the oscillating motion end judging section 18 in all of the divided oscillating shapes.
  • the numerical controller 13 has an electrode position detecting unit, and according to the processing conditions set by the processing condition setting unit 15, the Z-axis driving motor 1, the X-axis driving motor 8, and the Y-axis driving motor 8.
  • driving 10 the relative movement between the electrode 4 and the workpiece 5 is controlled.
  • the electrode 4 and the workpiece 5 are opposed to each other with a discharge gap in the machining fluid, and machining power is supplied from the power supply device 12 between the electrode 4 and the workpiece 5, and a machining condition setting unit is provided.
  • the workpiece 5 is applied by electric discharge according to the machining conditions pre-installed by 15 (or input by the operator).
  • the swing operation unit 14 calculates the movement amounts ⁇ X, ⁇ , ⁇ of the X-axis 9, the Y-axis 11, and the Z-axis 2 per unit time. Sent to 3.
  • the X-axis drive motor 8, the ⁇ -axis drive motor 10 and the ⁇ -axis drive motor 1 are driven by the numerical controller 13 to draw a rocking shape based on the predetermined rocking conditions. As a result, the electrode 4 and the workpiece 5 relatively swing along the swing shape.
  • FIG. 3 is an explanatory diagram showing a method of dividing the oscillating shape, and shows an example in which the number of divisions is 16.
  • FIG. 3 shows the case of the conventional dividing method and the case of the dividing method according to the present invention superimposed on the division shape of the corner portion of the target machining shape.
  • the conventional dividing method two divided shapes are arranged adjacent to each other at the corner of the target machining shape.
  • (E) of Fig. 3 shows the divided shape at the center of the side of the target machining shape.
  • 2 shows a case where the conventional dividing method is used and a case where the dividing method of the present invention is used.
  • the division angle of the division shape including the center of the side is changed by the conventional division method, and by the division method of the present invention.
  • (3) is smaller than (h) when using the conventional division method. Therefore, according to the dividing method of the present invention, it is possible to reduce the remaining portion at the center of the side, and to further improve the shape accuracy.
  • the target processing shape is a polygon
  • a combination of a part of the polygon with another shape may be used.
  • swing shape a polygon, an arc, a combination thereof, or the like can be used according to a target machining shape.
  • FIG. 4 is an explanatory diagram of a method of dividing an oscillating shape according to an electric discharge machining method according to a second embodiment of the present invention.
  • FIG. 4 (a) shows an example of a conventional divided shape.
  • (B) of FIG. 4 shows a method of dividing the oscillating shape according to the present invention so that the division angle ⁇ s becomes smaller as approaching the corner portion of the target machining shape.
  • the division as shown in (b) of FIG. This can be realized by using an angular function.
  • the number of the divided shape is N
  • the number of divisions is S
  • the angle of the electrode position as viewed from the oscillating coordinate origin is e
  • the position of the corner of the target machining shape is E. (45 in the first quadrant in Fig.
  • N SX EZ 3 60 + SX 45/360 XS in (20-90) (rounded down to the nearest decimal)
  • N SXE / 360—SX 45/360 X sin (20-90 in the second and fourth quadrants) ) (The fractional part is rounded down), so that the oscillating shape can be divided so that the division angle 0 s becomes smaller as it approaches the corner of the target machining shape. Therefore, it is possible to reduce the leftover of the corner portion, and it is possible to further improve the shape accuracy.
  • the remaining machining amount calculating unit 17 is a numerical control device having an electrode position detecting unit for detecting the electrode position in the oscillating coordinate every moment. 3 and calculate the electrode position when the target oscillation shape is reached from the numerical data of the oscillation shape in the machining conditions given by the machining condition setting unit 15 and calculate the target oscillation shape and the current electrode position. The remaining machining amount is calculated from the difference, and the calculation result is transferred to the oscillating motion control unit 19.
  • the oscillating motion control unit 19 sets the turning speed using the turning speed data prepared in advance from the remaining machining amount obtained from the remaining machining amount calculation unit 17, and sends an electrode to the numerical controller 13. It has a function to send operation commands. In addition, when a machining state having a large difference in swing speed is detected, the swing motion control unit 19 stores the remaining machining amount stored by the swing motion end determination unit 18 and the corresponding swing speed. It has a look-ahead function that calls from just before the position where the machining amount is large (that is, the turning speed is low), reduces the turning speed from the high-speed turning part, and moves the electrode to the low-speed turning part.
  • the turning speed is given as high as 20 mm / min.
  • the difference in the turning speed when the electrode moves from the divided shape 2 to the divided shape 1 is as large as 15 mm / min.
  • the turning speed switching command is issued when the electrode moves from divided shape 2 to divided shape 1.
  • a delay occurs by the position detection time and the calculation time of the remaining machining amount and the turning speed.For example, the delay time such as the electrode position detection time is 1 Oms and the turning speed is 20 mm / min (about 33 3 ⁇ 1117 3) In this case, the electrode will move about 3.3 m before the turning speed changes.
  • the present invention provides a pre-reading function as a pre-reading function, in which, when the difference in turning speed exceeds a predetermined value, the electrode movement is decelerated in advance. have.
  • the look-ahead function includes a swing speed VL calculated based on the remaining machining amount of the divided shape 1 stored by the swing motion end determination unit 18 at the time of the revolution before one revolution, and a predetermined speed before the electrode position reaches the divided shape 1.
  • the oscillating motion is completed at the time of turning one round before the number of divisions to the end.
  • the turning speed VH calculated from the remaining machining amount of the divided shape stored by the judgment unit 18 is compared with the value of (VH-VL). In the case where the electrode is larger than the reference, the turning speed is reduced from the previous divided shape by the predetermined number of divisions, and the electrode moves to the divided shape 1.
  • the swinging motion control unit 19 determines whether or not the divided shape 2 to the divided shape 3 have a larger turning speed than the VL compared with the predetermined reference.
  • a deceleration command is given at the time of the turning speed command, and the same turning speed as in the division shape 1 is given to move the electrode.
  • the pre-reading function the case where the movement of the electrode is decelerated and controlled when the difference in the turning speed exceeds a predetermined value is described, but when the difference in the remaining machining amount exceeds the predetermined value, The movement of the electrode may be decelerated.
  • the electric discharge machining method and apparatus according to the present invention are suitable for use in swing machining.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Abstract

L'invention concerne un dispositif et un procédé d'usinage à décharge électrique, dans lesquels une forme oscillante est divisée pour définir une modification de la vitesse de tournage et la fin d'un mouvement d'oscillation; il est déterminé pour chaque forme divisée si une forme d'usinage voulue est atteinte; et l'usinage par oscillation est terminé quand la fin des mouvements oscillants de toutes les formes divisées a été définie. Une forme oscillante est divisée de telle sorte que chaque coin d'une forme d'usinage voulue et/ou le milieu de chaque côté sont positionnés sur, ou approximativement sur une bissectrice d'un angle de division (υs).
PCT/JP1999/003744 1999-07-12 1999-07-12 Procede et dispositif d'usinage a decharge electrique Ceased WO2001003872A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE19983533T DE19983533B4 (de) 1999-07-12 1999-07-12 Elektroerosionsbearbeitungsverfahren und Vorrichtung
US09/786,866 US6580049B1 (en) 1999-07-12 1999-07-12 Electric discharge machining method and device
JP2001509332A JP3925197B2 (ja) 1999-07-12 1999-07-12 放電加工方法及び装置
PCT/JP1999/003744 WO2001003872A1 (fr) 1999-07-12 1999-07-12 Procede et dispositif d'usinage a decharge electrique
CN99810799A CN1126627C (zh) 1999-07-12 1999-07-12 放电加工方法和装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1999/003744 WO2001003872A1 (fr) 1999-07-12 1999-07-12 Procede et dispositif d'usinage a decharge electrique

Publications (1)

Publication Number Publication Date
WO2001003872A1 true WO2001003872A1 (fr) 2001-01-18

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ID=14236208

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1999/003744 Ceased WO2001003872A1 (fr) 1999-07-12 1999-07-12 Procede et dispositif d'usinage a decharge electrique

Country Status (5)

Country Link
US (1) US6580049B1 (fr)
JP (1) JP3925197B2 (fr)
CN (1) CN1126627C (fr)
DE (1) DE19983533B4 (fr)
WO (1) WO2001003872A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6667453B1 (en) * 1999-12-20 2003-12-23 Mitsubishi Denki Kabushiki Kaisha Electric discharge machining method and apparatus with control of rocking function parameters
JP5197886B1 (ja) * 2012-01-11 2013-05-15 三菱電機株式会社 ワイヤ放電加工装置
JP5788468B2 (ja) * 2013-11-28 2015-09-30 ファナック株式会社 駆動部品の摩耗を抑える機能を有するワイヤ放電加工機

Citations (3)

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Publication number Priority date Publication date Assignee Title
JPH0419018A (ja) * 1990-05-09 1992-01-23 Mitsubishi Electric Corp 放電加工方法
JPH06126540A (ja) * 1992-10-14 1994-05-10 Makino Milling Mach Co Ltd 放電加工方法及び装置
JPH10166224A (ja) * 1996-12-10 1998-06-23 Okuma Mach Works Ltd 揺動加工機能を有する数値制御放電加工機

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CH596940A5 (fr) * 1976-10-01 1978-03-31 Charmilles Sa Ateliers
JPS5355597A (en) * 1976-10-28 1978-05-20 Inoue Japax Res Inc Device for horizontally moving working table or spindle
US4247749A (en) * 1979-02-23 1981-01-27 Ateliers Des Charmilles S.A. Electrical discharge machining apparatus and process with controlled variable speed electrode orbiting
US4400606A (en) * 1979-10-11 1983-08-23 Mitsubishi Denki Kabushiki Kaisha Method and apparatus for discharge machining polygonal contours
US4367391A (en) * 1980-08-14 1983-01-04 Toshihiko Furukawa Method for pattern controlled electrode movement for E.D.M.
CH659018A5 (de) * 1980-09-10 1986-12-31 Mitsubishi Electric Corp Verfahren und bearbeitungseinrichtung zum elektroerosiven bearbeiten eines werkstueckes.
DE3814675A1 (de) * 1988-04-30 1989-11-09 Koenig Wilfried Prof Dr Ing Dr Bearbeitungsverfahren zum planetaererodieren
JPH07100262B2 (ja) 1988-10-07 1995-11-01 三菱電機株式会社 放電加工終了判定方法及びその装置
US5051912A (en) * 1989-02-07 1991-09-24 Hurco Acquisition Corporation Vectoring/orbiting control unit for electrical discharge machining
JP2604461B2 (ja) 1989-02-08 1997-04-30 株式会社牧野フライス製作所 放電加工方法及び装置
JPH03149137A (ja) 1989-11-07 1991-06-25 Mitsubishi Electric Corp 放電加工装置の揺動加工方法
JPH0542423A (ja) * 1991-08-09 1993-02-23 Amada Washino Co Ltd Ｎｃ形彫放電加工機の非対称形パターンの揺動加工方法
JP3149137B2 (ja) 1991-09-26 2001-03-26 株式会社リコー 画像領域識別装置
JPH07299666A (ja) * 1994-05-06 1995-11-14 Toyota Motor Corp 揺動型放電加工方法および装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0419018A (ja) * 1990-05-09 1992-01-23 Mitsubishi Electric Corp 放電加工方法
JPH06126540A (ja) * 1992-10-14 1994-05-10 Makino Milling Mach Co Ltd 放電加工方法及び装置
JPH10166224A (ja) * 1996-12-10 1998-06-23 Okuma Mach Works Ltd 揺動加工機能を有する数値制御放電加工機

Also Published As

Publication number Publication date
US6580049B1 (en) 2003-06-17
CN1316933A (zh) 2001-10-10
CN1126627C (zh) 2003-11-05
JP3925197B2 (ja) 2007-06-06
DE19983533B4 (de) 2010-02-25
DE19983533T1 (de) 2001-07-12

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